Subcategories:

Water covers over 70% of the Earth, cycling from the oceans and rivers to the clouds and back again. It even makes up about 60% of our bodies. But in the rest of the solar system, liquid water is almost impossible to find. So how did our planet end u...p with so much of this substance? And where did it come from? Zachary Metz outlines the ancient origins of water on Earth. (03:53)[more]

We continue our exploration of the Water Cycle by drinking some dinosaur pee. Yep! Well, it's a little less gross that it sounds. It turns out that all of the water on Earth is just constantly recycled in what we call a closed system. No water comes ...in and no water goes out. So that means that, at some point, it's possible the water we're drinking was once dinosaur pee. (04:47)[more]

In this video segment from ZOOM, two cast members repeat an experiment designed to separate fresh water from a liquid solution, this time using colored sugar water in one solar still and orange juice in another. The basic still design they employ tra...ps water vapor that is created when the Sun's heat causes water to evaporate. As the vapor cools, it condenses and trickles down to a collection container. Were they successful in their experiment this time? A final taste test reveals all. This video could also be used with a lesson about the scientific process and forming a hypothesis. Closed-captioning included. (03:55)[more]

Freshwater seems abundant, but when accounting for all the water on Earth, it's in limited supply. Just three percent of the water on our planet is freshwater. A majority of this water, about two percent of the world total, is contained in glaciers a...nd ice sheets or stored below ground. The remaining one percent is found in lakes, rivers and wetland areas or transported through the atmosphere in the form of water vapor, clouds and precipitation. Rain and snowfall replenish freshwater sources, making it vital to know when, where and how much water is falling at any given time. Using NASA's Global Precipitation Measurement satellite, researchers can track precipitation worldwide and monitor levels from space. (02:49)[more]

Thank You NASA Astronaut Barry Wilmore, Gov. Haslam and Congratulations Tennessee STEM students! Keep studying!! Water is the fundamental ingredient for life on Earth. Looking at our Earth from space, with its vast and deep ocean, it appears as thoug...h there is an abundance of water for our use. However, only a small portion of Earth's water is accessible for our needs. How much fresh water exists and where it is stored affects us all. This animation uses Earth science data from a variety of sensors on NASA Earth observing satellites as well as cartoons to describe Earth's water cycle and the continuous movement of water on, above and below the surface of the Earth. (05:53)[more]

This video addresses the water cycle, why we should care about our water. It explains that very little fresh water is available on the earth, and encourages the need to preserve the fresh water that we have. (03:28)

Please make your comments on categories positive, and not just negative.

People work hard on educational categories, and we want to encourage them to make more!

Profanity (curse words), sexually suggestive remarks, and other such obviously inappropriate comments
will be deleted immediately, and are grounds for immediate expulsion. Remember, children use this website.

Personal criticism on project forums and in video content is not allowed and will be deleted immediately.
Any violations of this rule could result in expulsion from the project so please, no insults or other negative
personal remarks.

Very harshly-worded criticism of content will also be deleted promptly. Please use your vote to express your
harshest feelings. Repeated violations of this rule can result in expulsion. If you must criticize another
person's hard work, then be nice about it.